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JWT Decoder & Token Inspector (100% Private Client-Side)
Decode and inspect JSON Web Tokens (JWT) in real time. Color-coded Header, Payload, and Signature breakdown with token expiration countdown and human dates.
Token Input
Header (Algorithm & Type)
{
"alg": "HS256",
"typ": "JWT"
}Signature
4zC9kZp7_L-3b7f_ZJ2J2J2J2J2J2J2J2J2J2J2J2J0
Payload (Claims Data)
Token Expired
Mon, 31 Aug 2026 16:00:00 GMT{
"sub": "1234567890",
"name": "Alex Morgan",
"email": "alex@example.com",
"role": "admin",
"iat": 1516239022,
"exp": 1788192000
}100% Client-Side Inspection • Confidential authentication tokens never leave your browser
Runs in your browser. No uploads.
How it works
- 1Splits the token into its 3 Base64URL-encoded segments (Header, Payload, Signature).
- 2Decodes UTF-8 byte arrays into formatted JSON trees.
- 3Parses standard claims (exp, iat, nbf, iss, sub) and calculates expiration validity.
Questions
Many developers inadvertently paste production auth tokens containing sensitive user emails and permissions into online decoders. Navureno runs 100% locally in your browser memory.